Filter unit having protective vial connection



FIG. 1 is a front elevational view of a filter unit having protective vial connection, showing my new design; with the broken line showing of the vials being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is an exploded perspective view thereof; with the broken line showing of the collection tubes being for illustrative purposes only and forming no part of the claimed design;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof, with all other sides being a mirror image thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a filter unit having protective vial connection, as shown and described. 